Search found 139 matches
- Wed May 21, 2014 1:45 pm
- Forum: Dev: Hardware
- Topic: A little ECU interconnect schematic/drawing I made
- Replies: 19
- Views: 15780
Re: A little ECU interconnect schematic/drawing I made
I like the idea of a TPU, but I wanted some universal/cheap solution. I think using a chip dedicated to timing is a good idea, and really not that complicated since the code would be very basic. You just send the values (ignition advance and dwell, injector pulse lenght) via usart/SPI, and the TPU t...
- Wed May 21, 2014 1:06 pm
- Forum: Dev: Hardware
- Topic: A little ECU interconnect schematic/drawing I made
- Replies: 19
- Views: 15780
A little ECU interconnect schematic/drawing I made
Hey Guys, I made a schematic for an ECU a while ago, I'm posting it here in case this helps you with hardware design https://docs.google.com/drawings/d/11KJt6j751w4kpBhkQMWXHyvrCQrZi3s3k0uUYk5S9fs/edit?usp=sharing This is the best compromise I could come with, but nothing has been tested, just ideas...
- Wed Apr 09, 2014 9:05 am
- Forum: Dev: Hardware
- Topic: let's choose an enclosure
- Replies: 121
- Views: 109582
- Fri Apr 04, 2014 2:47 pm
- Forum: Dev: Hardware
- Topic: analog inputs: op-amp + divider - Russian - now MCP6004
- Replies: 124
- Views: 134617
Re: analog inputs: op-amp + divider - Russian - LMV324IDT
I see
Yeah the ADC has 1kohm/8pF input so it should not affect it too much.
Yeah the ADC has 1kohm/8pF input so it should not affect it too much.
- Fri Apr 04, 2014 2:22 pm
- Forum: Dev: Hardware
- Topic: analog inputs: op-amp + divider - Russian - now MCP6004
- Replies: 124
- Views: 134617
Re: analog inputs: op-amp + divider - Russian - LMV324IDT
Why did you put the divider after the opamp ?
The higher output resistance might affect the ADC. (but no much)
The higher output resistance might affect the ADC. (but no much)
- Fri Apr 04, 2014 2:10 pm
- Forum: Dev: Software
- Topic: Knock sensing and Serial USB in software
- Replies: 10
- Views: 10029
Re: Knock sensing and Serial USB in software
With a higher frequency you get better precision, and you can take harmonics into account, to avoid false positive.Sergey89 wrote:TPIC8101/HIP9011 for example has a sampling frequency about 200 kHz. Who knows what is the reason of a choice this frequency ?
- Thu Apr 03, 2014 2:39 pm
- Forum: Dev: Software
- Topic: Knock sensing and Serial USB in software
- Replies: 10
- Views: 10029
Re: Knock sensing and Serial USB in software
Latency or being out of sync should not be an issue since we are running an RTOS.
Unless things are done really wrong.
This MCU has DSP instructions, it would be a shame not to use them
There is probably a way to implement the Goertzel algorithm using DSP as well.
Unless things are done really wrong.
This MCU has DSP instructions, it would be a shame not to use them
There is probably a way to implement the Goertzel algorithm using DSP as well.
- Wed Apr 02, 2014 12:30 pm
- Forum: Dev: Software
- Topic: Knock sensing and Serial USB in software
- Replies: 10
- Views: 10029
Re: Knock sensing and Serial USB in software
Indeed, Git support in Windows sucks. I only use command line which I feel is what works best. (Linux and Cygwin for windows) TortoiseGit stopped working for me, so it's not an option. MsysGit works pretty well. SVN is so limited for team work that I think sticking with it is will make you loose a l...
- Wed Apr 02, 2014 11:07 am
- Forum: Dev: Hardware
- Topic: Power supply - kb1gtt
- Replies: 212
- Views: 166961
Re: Power supply - kb1gtt
I'm looking at that sky-macau company as they offer this inductor http://www.sky-macau.com/Keyword-Search/C-0/k-3817361683/ the design uses 2X of them. Which costs about $1. The design should be posted shortly, and I'll be looking for people to review it. That company didn't have the catch diode I ...
- Wed Apr 02, 2014 9:42 am
- Forum: Dev: Hardware
- Topic: Power supply - kb1gtt
- Replies: 212
- Views: 166961
Re: Power supply - kb1gtt
For the LDOs, the thing is that often OEM ECUs are potted so they have a much better thermal coef. 80-90% from a non synchronous at low output voltages ? Optimistic. Datasheet shows 74% for 14v -> 3.3v, and 81% for 14v -> 5v. Diode's Vf is a big problem at low voltages. For the cost, you will save s...
- Tue Apr 01, 2014 2:06 pm
- Forum: Dev: Software
- Topic: Knock sensing and Serial USB in software
- Replies: 10
- Views: 10029
Re: Knock sensing and Serial USB in software
That was quick!
1) I could give a hand if you were using Git.
2) You probably need to play with the VBUS to force windows to reconnect. Also might need some delays.
3) Git is really as easy as SVN if you don't do crazy branching. It's just a mater of getting used to it.
Thanks
1) I could give a hand if you were using Git.
2) You probably need to play with the VBUS to force windows to reconnect. Also might need some delays.
3) Git is really as easy as SVN if you don't do crazy branching. It's just a mater of getting used to it.
Thanks
- Tue Apr 01, 2014 1:43 pm
- Forum: Dev: Software
- Topic: Knock sensing and Serial USB in software
- Replies: 10
- Views: 10029
Knock sensing and Serial USB in software
Hi, It seems most of the tasks are done on hardware, such as knock sensing and additional serial to USB. Why don't you do these in software? To me, knock sensing is simply calculating FFT on a buffer, and measuring the value of specific bins (frequency). Of course there are a few other things to do ...
- Tue Apr 01, 2014 1:26 pm
- Forum: Dev: Hardware
- Topic: Power supply - kb1gtt
- Replies: 212
- Views: 166961
Re: Power supply - kb1gtt
If you are gonna go for a DC converter, go for a synchronous, high frequency one.
For example: http://www.ti.com/product/lm25117-q1
Else just stick to an LDO for low ripple.
Going for an old converter like the LM2596 is really not the best option IMO.
For example: http://www.ti.com/product/lm25117-q1
Else just stick to an LDO for low ripple.
Going for an old converter like the LM2596 is really not the best option IMO.
- Tue Apr 01, 2014 1:01 pm
- Forum: Dev: Software
- Topic: RTOS options
- Replies: 33
- Views: 31667
Re: RTOS options
Ya, all the major MCUs used today by OEMs (SH, tricore, MPC56, etc.) have bad ass TPU units designed to offload a lot of the timing sensitive stuff. The TPU is almost as much silicon as the MCU in some of the newer Renesas designs. The TMS570 looks promising too, but the price on it is pretty damn ...
- Mon Dec 16, 2013 9:25 pm
- Forum: Dev: Hardware
- Topic: Power supply - Sergey89
- Replies: 20
- Views: 22006
Re: Power supply - Sergey89
I would use something like that: http://www.ti.com/product/tps54239e
Compared to an LDO you just need to add a tiny inductor. (3x3mm)
Compared to an LDO you just need to add a tiny inductor. (3x3mm)
- Mon Nov 25, 2013 10:04 am
- Forum: Dev: Hardware
- Topic: What about fancy output drivers?
- Replies: 12
- Views: 11430
Re: What about fancy output drivers?
It's a very specialized chip so I guess only big companies buy them in huge quantities... that's why.
It's the perfect chip (infineon has a few others) but it's almost impossible to buy at low quantities.
I had found that chip a while ago, but impossible to buy in europe...
It's the perfect chip (infineon has a few others) but it's almost impossible to buy at low quantities.
I had found that chip a while ago, but impossible to buy in europe...
- Sat Nov 23, 2013 12:16 am
- Forum: Dev: Hardware
- Topic: CAN bus
- Replies: 18
- Views: 15680
Re: CAN bus
You can get an OBD2 connector on site like ebay.
You will need a CAN transceiver such as the MCP2551 or the newer MCP2562 (for 3.3v compat) between the CAN pins of the STM32 and the bus lines.
You will need a CAN transceiver such as the MCP2551 or the newer MCP2562 (for 3.3v compat) between the CAN pins of the STM32 and the bus lines.
- Tue Nov 19, 2013 1:26 am
- Forum: Dev: Hardware
- Topic: VR + knock module
- Replies: 69
- Views: 148631
Re: VR + knock module
Why not use a simple buffer + DC bias to the ADC and do the rest in software?
The F4 has DSP capabilities so it's totally possible.
The F4 has DSP capabilities so it's totally possible.
- Tue Oct 29, 2013 10:12 am
- Forum: Dev: Software
- Topic: wideband AFR sensor interface
- Replies: 21
- Views: 19834
Re: wideband AFR sensor interface
http://www.14point7.com/
They have some really nice units.
Also there is the AEM UEGO which I've been using for a few years with my turbo civic, very good and the price it not that high.
They have some really nice units.
Also there is the AEM UEGO which I've been using for a few years with my turbo civic, very good and the price it not that high.